Angular http method: 'POST' is not sending the $ scope object

I have a problem in the http post method of angular, I have seen several tips but none works. Here is the code:

$scope.cadastrar = function () {
   $http({
        method: 'POST',
        url: '/MinhaConta/Cliente/PostAnuncio',
        data: $.param($scope.novo),
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
    })
    .success(function (data, status, headers, config) {
        if (data.Status) {
           $scope.hasMsg = true;
           $scope.hasError = false;
           $scope.hasSuccess = true;
           $scope.infoMsg = data.Mensagem;
        }
    })
    .error(function (data, status, headers, config) {
        $scope.hasMsg = true;
       $scope.hasSuccess = false;
       $scope.hasError = true;
       $scope.infoMsg = data.ErrorMessage;
    });
};

I've placed the scope to display my object information as I'm inserting:

Iinsertedabreakpointtoseeiftheobjecthasvalue

Theresponsereturnsmeanerrorwhichisadefaultreturniftheobjectisnull.WouldanyoneknowtotellmewhatI'mdoingwrong?

{  "typeid": 0,   "marcaid": 0,   "model": 0,   "versaoid": 0,   "manufacturing": 0,   "anomodelo": 0,   "km": 0,   "value": 0.0,   "color": null,   "fuel": null,   "plate": null,   "vscustom": null,   "exchange": false }

public class NovoVeiculo
{
    public int tipoid { get; set; }
    public int marcaid { get; set; }
    public int modeloid { get; set; }
    public int versaoid { get; set; }
    public short anofabricacao { get; set; }
    public short anomodelo { get; set; }
    public int km { get; set; }
    public decimal valor { get; set; }
    public string cor { get; set; }
    public string combustivel { get; set; }
    public string placa { get; set; }
    public string vscustom { get; set; }
    public bool troca { get; set; }
}

Thanks for the help right away.